@ankara-- I think pear brandy is usually made of Bartlett pears.
Isn't it cool how they get the pear in the bottle? I've always wondered how they manage to do that without damaging the pear. I think it's the coolest idea ever.
There is only one store in my area that has Poire William and it usually runs out quickly. I buy it regularly though so they give me a call when they have it in stock. My brother makes the best pear brandy cocktails with it.